Why is Agro-Climatic Zone III (South Bihar) characterized by a high dependence on groundwater and traditional 'Ahar-Pyne' systems compared to Zone I and Zone II?

Options:

• A: Due to the presence of perennial Himalayan rivers that flow through the southern plains.
• B: Due to the clayey nature of soils (Karail-Kewal) combined with lower, erratic rainfall and a sloping terrain that causes rapid surface runoff.
• C: Because the region is completely devoid of any alluvial soil deposits.
• D: Because the Sone River is the only source of water and cannot reach the eastern districts of Zone III.

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